91 ranger 2.3 when you accelerate the pedal to fast truck wants to die and jugs after letting off pedal and if you easy in to it runs good what could be replaced throttle position sensor what else?

if engine has carb.try replacing the accelerator pump,when worn out, will cause surging. problem. if engine has carb.try replacing the accelerator pump,when worn out, will cause surging. problem.also check coil. This can be caused by a worn timing belt. The 2.3 has had it's share of timing belt issues. I would get a HAYNES manual and check the timing belt most likely replacing the belt. When the belt is stretched, it has the effect of retarding the timing which will cause the problems you mentioned. These belts on these motors need to be replace every 70,000 miles to avoid this.